Most Prestigious Universities: Times Higher Education's 2013 World Reputation Rankings

The United States and the United Kingdom's six "super brands" have pulled farther away from the rest of the world's colleges and universities, but the nations’ other colleges and universities are increasingly vulnerable to global competition, according to Times Higher Education's 2013 World Reputation Rankings, a leading ranking of the world's universities.

The rankings use the Thomson Reuters Academic Reputation Survey to measure the power of universities' global brands within the market for the best professors, brightest students, richest business investors and most innovative research partners. The "super brands" have held the top six spots since the rankings began in 2011.

While the U.S. dominates the list with 43 universities in the top 100, its influence has diminished slightly since the inaugural ranking. One university has fallen off the top 100 list while two have dropped out of the top 50.